ODYNERUS. 311 



nearly forming on each side a sort of angle, acutely marginate 

 superiorly in an arc of a circle; the margin rough, slightly 

 elevated behind the post-scutel, crenulate, separated from post- 

 scutel by a fissure. Abdomen cylindrical ; the first segment 

 rather elongate, anteriorly rounded-truncate. 



Black, shining ; mandibles, apex of the tarsi, and antennae 

 beneath, ferruginous ; a line on the scape beneath, a frontal and 

 post-ocular spot, anterior margin of prothorax, two spots on the 

 margin of the tegulse, post-tegulse, one or two spots under the 

 wings, a line Dn post-scutel, and the margin of the first two abdo- 

 minal segments, luteous. Feet black. Wings subhyaline, the 

 nerves brown. 



Bess. a. diff. — It much resembles Ancistr. scdbriusculus, but is 

 distinct by its abdomen, without suture. 



Bab. Chili (Museum of Vienna). 



C. Form not very slender. Metathorax produced horizontally 

 beyond the post-scutel; then vertically truncate; the post- 

 scutel quite enveloped by it posteriorly, not reaching up to 

 the edge of the posterior face of metathorax ; the posterior 

 face of metathorax superiorly terminating in an erect crest, 

 parted by a fissure. Vertex in 9 having two pilose tubercles. 



This type is in the Stenodynerus, the corresponding represen- 

 tative of the type of A. i-sectus, in the Stenancistrocerus. It 

 has also the metathorax prolonged and the vertex armed with 

 two pilose tubercles. But the abdomen, although polished in the 

 same way, is much contracted at base. cP^V,& 



114. O. liictuosus Sadss.— Validus, ater, rugosus, nigro pilosus ; f n 

 olypeus piriformis, paulum punotatus, apiee pauluin ema^ginatus, bi- 

 dentatus. Caput et thorax orasse punctata, rugosissime secundum 

 longitudinera elevato-strigata ; vertice cirri's 2 pilorum nigrorum in- 

 Btruoto, pronoto cristato-marginato, angulato ; soutello lavi, nitido, 

 sparse punotato ; post-scutello depresso, integro; metathoraoe rugo- 

 sissimoj transverse elevato-striato, neo non utrinque subtus arcnato- 

 strigato, velutino et longe nigro- vel oinereo-piloso, pone post-scutellam 

 produoto, dein truneato ; postioe tantum in medio foveolato, grosse 

 strigato; sed in summo, supra foveolam in cristulam produoto, trans- 

 versam crenatam, in medio divisam. Abdomen nitidissiraum, sparse 

 Runotatum; primo segmento basi trunoato valde angustiore quam se- 

 cundum; seo undo supra in tuberoulum tumesoente.— Linea maudibu- 



larnm, macula* 2 laterales clyp.'i. linea in antonnai um seapo et macula 



d& . 



